MULTIPLEX MULTIcont BL-20 S-BEC Owner's manual

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Operating instructions for MULTIcont

BL-20 SD / SD-L brushless speed controllers

MULTIPLEX Modellsport GmbH & Co.KG • Westliche Gewerbestraße 1 • D-75015 Bretten • www.multiplex-rc.de Page 1/5

Instructions for MULTIcont BL-20 SD / SD-L # 82 5958 (12-04-03/BRAN) • Errors and omisssions excepted. •



MULTIPLEX

! These operating instructions are an integral part of this

product. They contain important information and safety

notes, and should therefore be kept in a safe place at all

times. Be sure to pass them on to the new owner if you ever

dispose of the product.

1. S

AFETY

N

OTES

! Read the instructions before using the controller

! Avoid heat build-up

Provide unobstructed air circulation round the controller

! Do not connect the flight battery with reversed polarity

Connecting the battery leads with reversed polarity will

instantly wreck the controller

For this reason:

• red wire to the POSITIVE terminal (+)

• black wire to the NEGATIVE terminal (-)

! When soldering or working on the motor or controller

Always disconnect the battery (short-circuit / injury hazard)

!

Caution: since different makes of transmitter use

different throttle travels, always start by programming

the throttle travel. ( 6. Table 1.)

! When testing and running the power system

Do not run the motor while holding it in your hand; always

secure the model firmly. Check that there is adequate space

for the propeller to rotate. Remove all objects from the area

around the propeller which could be sucked in or blown away

(clothing, paper etc.). Never stand in the rotational plane of

the propeller (injury hazard).

2. S

PECIFICATION

MULTIcont BL-20 SD BL-20 SD-L

Order No.: # 7 2232 # 7 2231

Max. continuous

current.:

20 A

Receiver power

supply (BEC):

max. 4S LiPo oder

12 Zellen NiXX

Cell count with BEC

disabled:

max. 4S LiPo oder

12 Zellen NiXX

BEC voltage: 5,0 V

BEC current: max. 2,0 A

Dimensions in mm

(approx.):

40x25x9

Weight incl. cables:

35 g 42 g

Maximum servo count for MULTIcont BL-20 SD / SD-L BEC

speed controllers in BEC mode**

MULTIcont BL-20 SD / SD-L

Maximum number of micro / standard

servos*:

4

Maximum number of high-torque

servos:

2

* MULTIPLEX Nano-S or Tiny-S servo types.

** If the number of servos in the model exceeds the stated

maximum, it is essential to disable the BEC system and use a

separate receiver battery ( 7.).

3. S

PECIAL

F

EATURES

MULTIPLEX MULTIcont BL-20 SD / SD-L speed controllers

include a series of interesting features:

• numerous programmable parameters

- Low-voltage cut-off for: LiPo or NiXX batteries

- Brake: ON or OFF

- Motor cut-off mode: motor power reduction, or

motor stop

- Motor start mode: standard, soft and super-soft.

- Timing: low, medium, high

• Safety start system prevents motor starting accidentally when

battery is connected

• Motor cut-off if serious radio interference occurs, or trans-

mitter signal fails: power reduction after one second of inter-

ference, motor off if interference longer than three seconds.

• Start-up guard: if the motor cannot run within two seconds,

the controller switches the motor off. To re-start the motor the

throttle stick must first be moved to the “Idle” position.

• Temperature guard: if the controller overheats, it reduces

power to the motor.

Caution: The BL-20 SD / SD-L can not be programmed with

the MULTImate!

4. W

IRING

!

Note: if you wish to use a different connector system for

connecting a MULTIcont BL-20 SD / SD-L speed controller to

your motor and / or battery, please note the following infor-

mation:

Soldering requires some care, as the quality of the joints is

crucial to the reliability of the power system:

• Use electronic-grade solder for all soldered joints

• Do not use acid-based solder flux

• Parts to be soldered must be hot enough (the solder must

flow), but must not be overheated (damage to components)

• If you are unsure, ask a modeller with experience in soldering

to help you

• Carefully insulate all solder joints and bare wires (e.g. using

heat-shrink sleeving)

Attaching the battery connectors

The battery connectors have to be attached to the two wires (red

= +, black = -). Keep the wires as short as possible. If necessary,

cut the battery leads to the required length. Fit a piece of heat-

shrink sleeve on each wire, and shrink the sleeve over the

soldered joint.

Take great care to maintain correct polarity when soldering the

battery connectors to the leads. Reversed polarity inevitably and

invariably wrecks the controller.

Connecting the speed controller to the motor

The motor is connected to the three wires which exit one end of

the controller. Solder sockets to the wires which match the motor

connectors, and insulate each soldered joint with a separate

heat-shrink sleeve. Keep the leads as short as possible.

If you need to reverse the direction of rotation of the motor,

simply swap over two of the three wires leading to the motor.

Connecting the three-core lead (UNI connector system) to

the receiver

Connect the three-core receiver lead (attached to the speed

controller) to the receiver input socket used for motor speed

control:

- With MULTIPLEX RC systems: channel 4 = throttle / motor

- With HiTEC RC systems: channel 3 = throttle / motor

Operating instructions for MULTIcont

BL-20 SD / SD-L brushless speed controllers

MULTIPLEX Modellsport GmbH & Co.KG • Westliche Gewerbestraße 1 • D-75015 Bretten • www.multiplex-rc.de Page 2/5

Instructions for MULTIcont BL-20 SD / SD-L # 82 5958 (12-04-03/BRAN) • Errors and omisssions excepted. •



MULTIPLEX

Pin assignment

Negative pin (−)

brown

Positive pin (+) red

Signal ( ) orange

Do not connect a separate receiver battery to the receiver,

as the controller supplies current to the receiver and servos

via the BEC circuit. Always keep to the maximum servo

count limit in BEC mode (



 2.). Disable the BEC system if

necessary (



 7.).

5. U

SING THE UNIT FOR THE FIRST TIME

MULTIcont BL-20 SD / SD-L controllers are set up by default to

work with LiPo batteries, and the brake is OFF.

0. First use of MULTIcont BL-20 SD / SD-L controllers

0.1 Programmable radio

control system:

set servo travel for

throttle / motor to 100%

on both sides of neutral

0.2 Move transmitter throttle

stick (and its trim) to the

motor OFF position

0.3 Transmitter ON

0.4 Connect fully-charged

flight battery

⇒ Rising sequence of sounds

⇒ LiPo mode: number of beeps

indicates the detection of a

LiPo battery with X cells

(in NiXX mode the following

signals are emitted immediately)

⇒ Long beep

⇒ Controller ready for use

Caution!

Rising sequence of

sounds after two beeps

Rapid sequence of

beeps

⇒ Controller is in programming

mode, because throttle channel is

reversed!

⇒ Throttle channel not at Idle.

! Note:

Programmable parameters

If you wish to change one of the programmable parameters,

please refer to the Programming section ( 6.).

Start-up protection

MULTIcont BL-20 BEC speed controllers are only armed when

the throttle stick is moved to the motor OFF position, and when

the audible “ready” indication has been emitted.

Always carry out a range check

Every time you wish to fly, carry out a range check with the RC

system switched on. Check in particular that radio range is not

diminished at full-throttle and half-throttle, and that no

interference occurs. Watch the servos in the model: if they jitter

or carry out random movements, this indicates an interference

problem which must be solved.

6. P

ROGRAMMING

MULTIcont BL-20 SD / SD-L speed controllers are ultra-simple to

program using just the transmitter throttle stick.

The status of programming using the throttle stick is indicated by

beeps, which also confirm any changes. The program works

through all altered parameters and options step-by-step. The

desired parameters (points 3. - 9.) are selected by moving the

throttle stick to the Idle position. Leaving the throttle stick at the

full-throttle position automatically takes you to the next

programming option.

Leaving programming mode:

1) Once you have adjusted a programming point, you can leave

programming mode by moving the throttle stick to the Idle

position within two seconds of hearing the confirmation sound.

The controller is then ready for use.

2) When you hear a double long beep [▬ ▬] (Point 10), move

the throttle stick to Idle within three seconds, otherwise the

software will work through programming options 3. to 10. again.

1.

Calibrate stick travel / throttle travel

1.1 Flight battery disconnected

Throttle stick to full-throttle

Transmitter ON

1.2

Connect fully-charged flight

battery

⇒ Rising sound sequence

⇒ In LiPo mode:

indicates number of

Li-Po cells detected

⇒

In NiXX mode the

following signal is emitted

im-mediately

⇒ Two short beeps [•_•]

After two seconds:

confirmation that maximum

throttle position was

detected correctly

1.3

Stick to motor OFF position

⇒ Long beep [▬]

(Confirmation after one

second that “minimum”

throttle was detected

correctly)

1.4

Power system ready for use

2.

Activate programming mode

2.1 Flight battery disconnected

Stick to full-throttle position

Transmitter ON

2.2 Connect fully-charged flight

battery

⇒ Rising sound sequence

⇒ In LiPo mode:

Indicates number of

LiPo cells detected

⇒ In NiXX mode the

following signal is emitted

im-mediately

⇒ Two short beeps [•_•]

⇒ Rising sound sequence:

controller is in programming

mode

Operating instructions for MULTIcont

BL-20 SD / SD-L brushless speed controllers

MULTIPLEX Modellsport GmbH & Co.KG • Westliche Gewerbestraße 1 • D-75015 Bretten • www.multiplex-rc.de Page 3/5

Instructions for MULTIcont BL-20 SD / SD-L # 82 5958 (12-04-03/BRAN) • Errors and omisssions excepted. •



MULTIPLEX

3. Select brake mode

Single short beep [•]

3.1

Set brake

⇒

Stick to Idle position

within three seconds

3.2 Brake “OFF”*

(= default)

Brake “ON”

⇒ “Beep [•]” -> Stick to full-

throttle position -> Brake

“OFF”

⇒ “Beep beep [•_•]” -> Stick

to full-throttle position ->

Brake “ON”

⇒ Confirmation signal

emitted

3.3 Next programming option

Leave programming mode

⇒ Leave stick at full-throttle

position

⇒ Stick to Idle position

within two seconds of

hearing confirmation signal

3.2

4. Select battery type

Double short beep [•_•]

4.1 Set battery type

⇒ Stick to Idle position

within three seconds

4.2 Li-XX*

(default)

Ni-XX

⇒ “Beep [•]” -> Stick to full-

throttle position -> “Li-XX”

⇒ “Beep beep [•_•]” -> Stick

to full-throttle position ->

“Ni-XX”

⇒ Confirmation signal

emitted

4.3 Next programming option

Leave programming mode

⇒ Leave stick at full-throttle

position

⇒ Stick to Idle position

within two seconds of

hearing confirmation signal

4.2

5. Select motor cut-off type

Triple short beep [•_•_•]

5.1

Set cut-off type

⇒ Stick to Idle position

within three seconds

5.2 For reduced motor power

(soft cut = *default)

For motor cut-off (hard stop

/ cut-off)

⇒ “Beep [•]” -> Stick to full-

throttle position -> “Soft cut”

⇒ “Beep beep [•_•]” ->

Stick

to full-throttle position ->

“Cut-off”

⇒ Confirmation signal

emitted

5.3 Next programming option

Leave programming mode

⇒

Leave stick at full-throttle

position

⇒ Stick to Idle position

within two seconds of con-

firmation signal 5.2

6. Select cut-off voltage

Quadruple short beep [•_•_•_•]

6.1

Set cut-off voltage

⇒ Stick to Idle position

within three seconds

6.2 Low

Medium* (= default)

High

⇒ “Beep [•]” -> Stick to full-

throttle position -> “Low”

⇒ “Beep beep [•_•]” -> Stick

to full-throttle position

-> “Medium”

⇒ “Beep beep beep [•_•_•]”

-> Stick to full-throttle

position -> “High”

⇒ Confirmation signal

emitted

- LiPo batteries:

Low / Medium / High = 2.6 V /

2.85 V / 3.1 V

- NiXX batteries:

Low / Medium / High = 0% /

45% / 60% of battery voltage

when initially switched on.

(0% = OFF)

6.3 Next programming option

Leave programming mode

⇒ Leave stick at full-throttle

position

⇒ Stick to Idle position

within two seconds after

hearing confirmation signal

6.2

7. Select Start-up behaviour

Single long beep [▬]

7.1

Set motor start behaviour

⇒ Stick to Idle position

within three seconds

7.2 Normal* (default)

Soft

Very soft

⇒ “Beep [•]” -> Stick to full-

throttle position -> “Normal”

⇒ “Beep beep [•_•]” -> Stick

to full-throttle position ->

“Soft”

⇒ “Beep beep beep [•_•_•]”

-> Stick to full-throttle

position -> “Very soft”

⇒ Confirmation signal

emitted

- Motor start-up time = “Soft”

approx. 1.0 seconds

- Motor start-up time = “Very

soft” approx. 2.0 seconds

- Throttle returned to Idle within

three seconds after applying

full-throttle => Temporary

“Normal” start-up behaviour (for

aerobatics)

7.3 Next programming option

Leave programming mode

⇒ Leave stick at full-throttle

position

⇒ Stick to Idle position

within two seconds after

hearing confirmation signal

7.2

Operating instructions for MULTIcont

BL-20 SD / SD-L brushless speed controllers

MULTIPLEX Modellsport GmbH & Co.KG • Westliche Gewerbestraße 1 • D-75015 Bretten • www.multiplex-rc.de Page 4/5

Instructions for MULTIcont BL-20 SD / SD-L # 82 5958 (12-04-03/BRAN) • Errors and omisssions excepted. •



MULTIPLEX

8. Select timing

One long beep, one short beep [▬_•]

8.1

Set timing

⇒ Stick to Idle position

within three seconds

8.2 Low* (default)

Medium

High

⇒ “Beep [•]” -> Stick to full-

throttle position -> Low

⇒ “Beep beep [•_•]” -> Stick

to full-throttle position ->

Medium

⇒ “Beep beep beep [•_•_•]”

-> Stick to full-throttle

position -> High

⇒ Confirmation signal

emitted

Low is the default setting, and can be

used with most motors. If you are not

satisfied with your motor’s running

characteristics -> try the Medium or High

setting.

8.3 Next programming option

Leave programming mode

⇒ Leave stick at full-throttle

position.

⇒ Stick to Idle position

within two seconds of

hearing confirmation signal

8.2

9. Default settings

One long beep, two short beeps [▬_•_•]

9.1

Reset to default settings

⇒ Stick to Idle position

within three seconds

9.2 Reset to default settings

⇒ Confirmation signal

emitted

=> Controller ready for use!

10. Leave programming mode

Two long beeps [▬_▬]

10.1

Leave programming mode

⇒ Stick to Idle position

⇒ Confirm signal emitted

=> Controller ready for use!

* Default setting / as supplied

7. BEC

=

B

ATTERY

E

LIMINATOR

C

IRCUIT

MULTIcont BL controllers are equipped with a high-performance

BEC system: current is supplied to the receiver and servos from

the flight battery via the controller. A separate receiver battery is

not required.

Do not connect a separate receiver battery!

Please note that the BEC system of MULTIcont BL controllers

can only supply a limited current for the airborne receiving

system. The maximum current which the BEC circuit can deliver

varies according to the operating voltage (battery voltage). The

higher the voltage, the lower the maximum BEC current:

max. P

BEC

= (U

BATT

– U

BEC

) x I

U

BEC

= 5.0 V

The actual current drawn by a servo varies according to its

performance, the frequency of commands and – in parti-cular –

the freedom of movement of the control surface linkages(!). This

means that it is essential to measure the current drain of the

servos in the model before the first flight, and at regular intervals

thereafter.

If you have no means of measuring the BEC current: carry out a

test-run on the ground: operate the servos in a “normal” way

(similar to flying the model) until the low-voltage cut-off is

triggered (i.e. battery flat). At this point the speed controller

should be no more than warm to the touch, and the servos must

work properly all the time, without ever threatening to fail or move

erratically.

! Note: disabling the BEC system

The BEC system must be disabled, and a separate receiver

battery must be used instead, if:

• the model carries more servos, or servos with a higher

current drain, than is permissible for the selected battery cell

count ( 2.), or

• problems are evident during the test-run, or

• the model is powered by a NiXX flight battery with more than

nine cells

Disabling the BEC system: locate the UNI connector attached to

the three-core lead. Use a pointed instrument to raise the plastic

lug of the red wire (+), and withdraw the red wire from the plastic

housing. Insulate the bare metal parts with a heat-shrink sleeve.

8. L

OW

-

VOLTAGE CUT

-

OFF WITH RESET

FUNCTION

If the battery voltage falls to the low-voltage threshold, the

controller automatically cuts off power to the motor. This ensures

that sufficient energy is available for the BEC power supply to

allow a safe landing to be carried out. A steady decline in motor

speed is a further indication that the flight battery is almost

discharged; you should initiate the landing as soon as you

become aware of this.

If the controller cuts the motor, it can be switched on again briefly

if required by momentarily moving the throttle stick to the motor

OFF position (Reset function).

! Note: do not use the low-voltage reset function more

than once or twice

Repeated throttling back to re-arm the motor may dis-charge the

flight battery to the point where the receiver power supply falters

and fails. Note that LiPo flight batteries can be permanently

damaged if they are deep-discharged.

! Note: if you are using the latest generation of LiPo batteries,

the low voltage cut-off function will not work correctly due to the

Operating instructions for MULTIcont

BL-20 SD / SD-L brushless speed controllers

MULTIPLEX Modellsport GmbH & Co.KG • Westliche Gewerbestraße 1 • D-75015 Bretten • www.multiplex-rc.de Page 5/5

Instructions for MULTIcont BL-20 SD / SD-L # 82 5958 (12-04-03/BRAN) • Errors and omisssions excepted. •



MULTIPLEX

cells’ constantly high voltage curve; in this case the speed

controller is unable to cut the motor in good time. In these

circumstances you should fly using a current sensor or a timer, to

avoid discharging the drive battery to a dangerous level.

9. F

INDING AND CORRECTING FAULTS

- When you connect the battery, the motor does not start, and the

speed controller beeps:

• Double beeps [••_••_••...] at one-second intervals

=> the battery voltage is too high or too low

• Single beeps [•___•___•...] at two-second intervals

=> non-standard throttle signal

• Single beeps [•••••...] at 0.25 second intervals

=> throttle stick is not at Idle position

• Rising sequence of sounds after two short beeps [•_•]

=> throttle channel is reversed; controller is in programming

mode.

- Motor rotates in the wrong direction:

• Interchange any two of the three motor wires.

- Nothing works: receiver, servos and speed controller do not

respond in any way

• Check all plugs, sockets and soldered joints for poor or

intermittent contact, and check polarity (+/-) once more. If

the system still does not work, ask for advice from the

dealer who sold you the speed controller.

- The motor stops when running:

• Throttle signal not reaching the controller

• Controller has entered low-voltage cut-off mode

• One or more connectors not making contact, or only making

intermittent contact.

10. G

UARANTEE

/

L

IABILITY

E

XCLUSION

Our products are covered by the currently valid statutory

guarantee regulations. If you wish to make a claim under

guarantee, please contact the model shop where you originally

purchased the unit.

The guarantee does not cover faults caused by:

• Incorrect handling, incorrect connections, reversed po-larity

• The use of accessories other than original MULTIPLEX items

• Modifications or repairs not carried out by MULTIPLEX or by

an authorised MULTIPLEX Service Centre

• Accidental or deliberate damage

• Normal wear and tear

• Use of the unit outside the stated Specification

MULTIPLEX Modellsport GmbH & Co.KG accepts no liability for

loss, damage or costs which are caused by the incorrect or

incompetent use of the product, or are con-nected with such use

in any way.

11. CE

C

ONFORMITY

D

ECLARATION

This device has been assessed in accordance with

the relevant harmonised European directives.

You are therefore the owner of a product whose design fulfils the

protective aims of the European Community relating to the safe

operation of equipment.

You are entitled to see the conformity declaration. Please ask

MULTIPLEX Modellsport GmbH & Co.KG for a copy.

12. D

ISPOSAL

N

OTES

Electrical equipment marked with the cancelled waste

bin symbol must not be discarded in the standard

household waste; instead it must be taken to a suitable

specialist disposal or recycling system.

In the countries of the EU (European Union), electrical

equipment must not be discarded via the normal domestic refuse

system (WEEE - Waste of Electrical and Electronic Equipment,

Directive 2002/96/EG). You can take un-wanted equipment to

your nearest local authority waste collection point or recycling

centre, where the staff will dis-pose of it correctly and at no cost

to yourself.

By returning your unwanted equipment you can make an

important contribution to the protection of our shared

environment!

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